Tonight is the last opportunity this year to check out "Manhattanhenge," a twice-a-year phenomenon when the sun aligns with the city's grid.

The best time to see "Manhattanhenge" will be at 8:24 p.m., according to multiple published reports, and again on Saturday at 8:25 p.m., though that will only be a half sun.

Ideal locations to see the solar phenomenon are on 14th, 23rd, 34th and 42nd streets.

The term "Manhattanhenge" comes from Hayden Planetarium Director Neil deGrasse Tyson. He said the way the sun shines on the buildings reminded him of how the sun aligns with the ancient stones in Stonehenge.